How to convert a WebM video to MP4 in GNOME correctly

When you record a video in GNOME, the video will be aved in WebM format. WebM is a good format for video compression, but is not as widely supported as MP4. If you need to share your video with someone who does not have a WebM player, you may need to convert it to MP4 format.

The following command will convert a WebM video to MP4 format:

ffmpeg -i input.webm output.mp4

However, this command will create a file that is larger and slower than the original WebM file.

To fix this, you can use the following command:

ffmpeg -i input.webm -vf mpdecimate -c:a copy -vsync vfr ouput.mp4

This command will use the mpdecimate filter to reduce the frame rate of the video. This will make the file smaller without sacrificing too much quality.

The -c:a copy option tells ffmpeg to copy the audio stream from the input file to the output file without re-encoding it. This will save time and ensure that the audio quality is not lost.

The -vsync vfr option tells ffmpeg to use variable frame rate encoding. This will ensure that the video plays smoothly on all devices.

To use this command, simply replace input.webm with the path to your input video file and output.mp4 with the path to the output video file.

For example, to convert the video my_video.webm to MP4 format, you would use the following command:

ffmpeg -i my_video.webm -vf mpdecimate -c:a copy -vsync vfr my_video.mp4

This will create a new video file called my_video.mp4 that is smaller and faster.